package com.by.server.config.security;

import org.springframework.context.annotation.Configuration;
import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Component;

import java.util.Collection;

/**
 * description : 权限控制-判断用户角色
 * author      : YuFei
 * data        : 2021/11/16 10:32
 */
@Component
public class CustomUrlDecisionMapper implements AccessDecisionManager {
    @Override
    public void decide(Authentication authentication, Object object, Collection<ConfigAttribute>
            configAttributes) throws AccessDeniedException, InsufficientAuthenticationException {
        for (ConfigAttribute configAttribute : configAttributes) {
            // 当前url所需角色
            String needRole = configAttribute.getAttribute();
            // 判断角色是否是登陆即可访问的角色，该角色在CustomFilter中定义
            if ("ROLE_LOGIN".equals(needRole)) {
                // 判断是否登录
                if (authentication instanceof AnonymousAuthenticationToken) {
                    throw new AccessDeniedException("尚未登陆，请登录");
                } else {
                    return;
                }
            }
            // 判断角色是否是url所需的角色
            Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
            for (GrantedAuthority authority : authorities) {
                if (authority.getAuthority().equals(needRole)) {
                    return;
                }
            }
        }
        throw new AccessDeniedException("权限不足，请联系管理员");
    }

    @Override
    public boolean supports(ConfigAttribute attribute) {
        return false;
    }

    @Override
    public boolean supports(Class<?> clazz) {
        return false;
    }
}
